Every culture has them, I suppose; numbers that are considered unlucky because of superstitions. In the U.S., the number 13 is considered unlucky.
Well, in Korea the unlucky number is 4. (Knowing this won me a kimchi noodle bowl at a Korean presentation at the library. 🙂 )
Four has been deemed unlucky in Korea because it sounds like the Chinese word for “death.” (This refers to four in Sino-Korean numbers, which is 사 and is pronounced “sah.”) Four is also considered unlucky in China and Japan as well.
So why should you know this? Well, it will help you understand why certain buildings in Korea don’t have a “fourth” floor. And it might be best to avoid groupings of things in fours, like when you’re giving gifts. Not to mention it might win you something in trivia someday.